Telephone system



B. D. CAMPBELL. T E'LEPHONE SYSTEM. APPLICATION FILED APR. 3. 19!].

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TELEPHONE SYSTEM.

APPLICATION FILED APR. 3. 1917.

Patented Aug-4), 1920.

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B. D. CAMPBELL, TELEPHONE SYSTEM. APPLICATION FILED APR-3, um.

Patented Aug. \3, 1920.

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UNETED STATES PATENTOFFICE.

BRYANT D. CAMPBELL, OF OAKLAND, CALIFORNIA.

TELEPILIOINE sYsrrEiiI.

To all whom it may concern:

Be it known that I, BRYANT D. CAMPBELL, citizen of the United States,residing at Oak land, in the county of Alameda and State of California,have invented certain new and useful Improvements in Telephone Systems,of whichthe following is a specification.

This invention is a central-controlled pay. telephone system- Theinvention comprises a central telephone system equipped with a coinmechanism, controlled by central, for collecting and registering eachcoin which is paid by a calling party when central establishes thevconnection between the calling party. and called party, and forreturning the coin to the calling party when central fails to establishsuch connection.

The invention is particularly adapted to be embodied in the standard\Vestern Electric Co. Code 293A telephone. i

The invention is illustrated in the accompanying drawings which formpart of this specification and the appended claims.

Referring to the. drawing:

Figure l is a diagram of a portion of a telephone system'embodying myinvention shown in normal condition.

Fig. 2 is a diagram of the invention with the receiver of the callingtelephone off the hook and connection established between said telephoneand central.

Fig. 3 is a diagram showing the coin mechanism operated by central toreceivethe coin of the calling party; the transmitter of the callingtelephone shorted out by central and the receiver of the callingtelephone Stllllll conn ction with central.

Fig. A is a diagram showing the coin mechanism of the calling telephonerestored .to normal condition by the calling party after the coin of thecalling party has been collected and registered by said mechanism; andthe transmitter and receiver of the calling telephone connected bycentral for speaking with the called party.

Fig. 5 is a diagram showing the coin mech anism actuated by central forreturning a deposited coin to the calling party when cen-. tral fails toconnect the calling party with the called party.

Fig. 6 is a rear elevation of the coin mechanism of oneof the telephonestations in the system, the casing of said mechanism being shown insection. p

Fig. 7 is an elevation of the coin mecha- Specification of LettersPatent.

Patented A11 3, 1920.

Application filed April 3, 1917. Serial NOI159A40.

nism with certain parts removed and the casing shown in section, showingthe interior operating parts of the mechanism.

Fig. 8 is a plan view of the coin mecha: nism, the casing being shown indotted lines.

Fig. 9 is a front elevation of the coin mechanism with the casing shownin section.

10 is a sectional view of the coin mech anism taken on line l010 of Fig.7.

Ptefe' ring to Figs. 1- to 4 inclusive, A indicates a portion of thecircuit of a central controlled telephone system embodying my inventionin which are included a telephone B and my coin collecting andregistering mechanism C. The telephone B may, as shown, be the standardlVestern Electric Co. Code 293A telephone but the invention isapplicable to other telephones.

lrlycoin collecting and registering mechanism may be described asfollows:

Numera 1 indicates-a frame upon which the parts-10f the mechanism aremounted. lVithin said frame islocated a coin chute 2, extendindownwardly from the top of the frame. bracl-ret 8 extends outwardly fromone side wall of the chute, in which a coin arresting lever is pivotedat 5. A pin 6 extends inwardly from said lever and is adapted to beprojected through an aperture 7 in the side wall of the chutein thevpath of thecoin, as will be described hereinafter. A spring 8 is'adjustably clamped at its upper end on a threaded pin 9, extending fromthe frame, between two thumb nuts 10 and 11, the lower end of whichspring en gages the coin arresting lever at one side of lts QlYOi) andnormally mamtalns the lever in position with the pin 6 withdrawn fromthe chute 2 in the path of the coin which pin is adapted to arrest thecoin in the chute adjacent an opening 15 in wall 16 of said chute asshown in dotted lines in Fig. 7. p

A coin-actuating lever 20 is pivoted at 21 to the frame 1 at one side ofthe chute and has a pair of pins 22 projecting from its lower endthrough slots 23 in the side wall 2st of the chute. A spring 25 securedat 26 to the frame 1 en ages the lower portion of the lever 20 andnormally maintains said lever in position with the pins 22 at the endsof the slots23 at the side of thechute, p

per end of chute 2 through which a coin may beintroduced into the upperend of said chutefThe' opening 15 of chute 2 leads into the upper end ofachute 37, the lower end of which opens into a coin drawer 38 in thebottom of the casing l.

A coin-actuated register lever 40 is pivoted at-41 with its forward armextending 1 to the opening 15 of chute 2 and resting directly above theupper end of chute 37. To the rear arm of said lever is connected theupper'end of link 42, the lower end of which is connected to theoperating arm 43 of a 7 coin register 45.

" the frame 1, 'engages'the upper side of the ter operating arm andmechanism in their lever 40 and holds said lever and the regis-' initialposition to be operated'by the coin as will be hereinafter described. Apin 48 extends from lever 40 through a slot 49 ina sidewall of theframe 1. The chute 2 is provided with a side opening 156 at its lowerend which communicates with an out- .let15'7 in; the side wall of thecasing which outlet opens into a coin delivery receptacle 160, and thebottom wall 161 of the 4 chute inclines downwardlyto said receptacle andoutlet into the delivery receptacle as complishing these results willnow be de so as toallow acoin released from the pin 6' to roll out'ofthe chute through said opening will be hereinafter described.

lrleansare provided whereby central may- -kill."thetransmitter T of thecalling telephone'B, and keep it dead when the con nection' betweenthe-calling and the-called parties made, until thecalling party drops acom into and operates the com mechanism and registers and delivers thecoin into the coin collecting receptacle, which means also includesmeans to release and return the com to the calling party when centralcannot make the connection. The means for ac-' scribed.

A magnetic switch generally indicated 50 is mounted on the frame l'ofthe coin mechanism. Said switch comprises a pair of spring contact arms51 and apair of spring contact arms 52, a switch actuating lever 5'3pivoted at 54and two magnets 55 and 56.

The lever53 isso pivoted that one of its arms'57 'restsabove the contactarms 51 and its other arm 58 rests under the-contact arms 52. The arm 58is heavier than the arm 57 and normally overbalances said arm and.

restsupon a pin 58 on the-frame 1, whereby A spring 46 secured'tothe'lever is: maintained in horizontal inoperative position with thearms 57 and 58 out of engagement with contact arms 51 and 52. Themagnets 55 and 56 are located respectively adjacent arms 57 and 58. Saidmagnets are wound in series with each other,

but in opposite directions so that a positive current in magnet 55 willattract the lever arm 57 while a positive current in magnet 56 willattract lever arm 58. The magnet 55 is connected by lead59 at terminal60 to main 61 while the magnet56 is connected by lead 62 to a springcontact arm 63 which visadapted'to contact with spring contact arm 64which is connectedby lead 65 and grounded at66. A lead 67 connectstransmitter lead 68 to the inner. contact arm 51 and a lead 69 connectsthe otherfltransmitter lead 7 0 to the outer contact arm '51. Leads 71and '72 respectively connect magnet 12 with lead 59 and the innercontact 52. A

lead 73 connects outer contact 52 and lead 62. A battery 80' isconnectedat its positive pole by lead 81 to'main 61 and has its negativepole grounded at82. A'switch 83 is connected in series with lead '81 andis adapted tocontrol the current from the battery 80. A battery 90 isconnected at its negative pole by lead'91 to main 61 and has itspositive pole grounded at 92. j A switch 93 is connected in series withlead 91 and is adapted to control the current from the battery 90. Theswitches 83 and 93 are an ranged in'the central ofiice within convenientreach of the central operator. The transmitter lead 681s connected toreceiver spring contact arm 95. A spring'contact arm 96 is located:adjacent arm 95 and a spring contact arm 97 is located adjacent contactarm '96. The arm '95 has a finger 98 which extends into the plane ofcontact arm 64. The arm'95'has afinger99'and the receiver hook 101'hasfa cam 101 adapted when thereceiverR is'on the'hook to engage saidfinger and hold the contact arm 95:ou t of contact with contact arm96,-and the finger 98 out of engagement with contact arm 64, and so astoallow the contact 96 to springout of contact with contact arm 97 and'thecontact arm 64'to spring out of contact with contact arm 63. Contact arm96 is connected by leads 1 02 and 103 to one the other end of saidprimary being connected bylead 106 at terminal 107 to main 110. Thecontact arm 97 is-connected by lead 111 to one terminal of receiver R,the other terminal of which is connectedby lead 112 to one end ofsecondary 1130f induction coil105, the other" end of said secondarybeing connected by leads 114 and 115 i end of the primary 104 ofinduction coil 105,

through bell 116 to terminal 1070f main 110. p

The operation of my invention is as follows:

The calling party takes the receiver R olf I the hook 101, and the hookswinging upwardly causes the cam 101 to remove its pressure from finger99 which allows arm 95 to spring into contact with contact arm 96 andcause contact arm 96 to contactwith contact arm 97, and causes finger 98to engage contact arm 64 and press said contact into contact withcontact arm 63. A circuit is then established from central through main61, lead 70 through transmitter T,'lead 68, contact arms 95 and 96,leads 102 and 103, primary 104, lead 106, main 110 back to central. aidcircuit is extended from contact arm 96 through contact 97, lead 111,receiver R, lead 112, secondary 113, leads 114 and 115 and main 110 backto central. The calling party and central then communicate through thetransmitter and receiver circuit, the calling party calling the numberof the telephone of the party to be called. This condition isillustrated in Fig. 2. Central then closes switch 83 and a current issent from battery 80, through lead 81, main 61, leads 59, coils 55 and56, lead 62, contacts 63 and 64, lead 65 to ground 66 back to battery 80through ground 82, whereby a positive magnetic field is established inmagnet 55 and a negative magnetic field established in magnet 56 and themagnet 55 attracts lever arm 57 and causes said arm and arm 58,respectively, to engage and close contacts 51 and 52; whereupontransmitter T is shorted out through lead 67, contacts 51 and lead 69,and a circuit is established from lead 59 through lead 71, throughmagnet 12 and lead 72, contacts 52, lead 73 to lead 62 and the lever 4is swung by magnet 12 and pin 6 projected into coin chute 2 of the coinmechanism. This condition is shown in Fig. 3. When central connectscalled party with calling party and calling party hears called partyspeak, the calling party then drops the proper coin 100 through slot 36into the chute 2 and the coin is arrested in the chute by pin 6. Thecalling party then places his finger on hook 30 and depresses the same,whereupon the lever 20 swings on its pivot and the pins 22 engage theedge of the coin 100 and force it through chute slot 15 between thelower end 140 of said slot and the forward arm of coin register lever41, and the coin raises said register lever until it passes into chute37 through which it drops into and is collected by the coin drawer 38,during which operation of the lever 40 by the coin, the register 45 isoperated through link 42 and arm 43 and the coin is registered by theregister, and at the same time the pin 48 engages and swings switch arm58 down and switch arm 57 up, taking pressure off contacts 51 and 52 andbreaking transmitter short circuit and coin chute pin circuit. Thetransmitter T is now brought back into the circuit so that the callingparty may talk to the called party, and the pin 6 is withdrawn from thechute 2 by the spring 8 swinging the pin end of lever 4 outward. Thecalling and called par-. ties now talk to each other. This condition isshown in Fig. 4. The parties upon completing their conversation hang uptheir receivers and the system is thereby brought back to normalinoperative condition as shown in Fig. 1. 1 I

In case the called party fails to answer, the operator momentarilyvcloses switch 93, whereupon a reverse current is established frombattery 90, through lead 91, main 61, lead 59, magnets 55 and 56, lead62, contacts 63 and 64, lead 65 to ground 66 back through ground 92 tobattery 90, and a field is established in magnet 56. The lever arm 58 isthen attracted by magnet 56 and the lever 53 swung so that the arms 57and 58 disengage the contact arms 51 and 52 and break the transmittershort circuit and the circuit including magnet 12. The system is thenreturned to normal condition as shown in Fig. 1.

In case the calling party should drop his coin in the chute when thecalled party does 'not answer, the breaking of the circuit includingmagnet 12 by the operation of switch 93 by central allowing the spring 8to operate lever 4 and withdraw pin 6 from the coin chute would releasethe coin and it would drop into the receptacle 60 where the callingparty could take it.

Normally the pin 6 rests outside the chute so that if a coin is droppedinto the chute it will roll out into the receptacle 60.

I claim:

1. In a central controlled pay telephone, a coin mechanism, meanswhereby the transmitter of the calling party is made inoperative untilthe calling and called parties are connected, and the coin mechanism setto receive the coin of the calling party, and means whereby the coinmechanism may be actuated by the calling party to collect and registerhis coin when the calling and called parties are connected.

2. In a pay telephone system, a coin mechanism, means for preventing thecalling party from utilizing the telephone to speak to the called partyuntil the calling party has deposited the right coin in the coinmechanism, and means whereby the calling party may actuate said coinmechanism to register and collect the right coin which said party dropsinto said coin mechanism.

3. In a telephone system, a coin mechanism, means whereby central mayprevent the calling party from utilizing the telephone to speak to thecalled party until the calling party has deposited the right coin in thecoin mechanism, means whereby the coin may be collected and registeredwhen cen tral has connected the calling party and called party, andmeans whereby the calling party may actuate said coin mechanism toregister and collectthe right coin which said party drops into said coinmechanism.

4. In a' pay telephone system, a coin mechanism, means'for preventingthe calling party from utilizing the telephone to speak to the calledparty until the calling party has deposited thewright coin in the coinmechanism, and means whereby the calling party may actuate said coinmech'anismto reglster andv collectfthe right'coln which sald party dropsinto said coin niechanlsm,

' and means operated by the coin mechanism when the coin is collectedand registered whereby the calling and called parties are connected. r

,5. In 7 a pay telephone system, a coin mechanism, means for preventingthe calling' party from utilizing the telephone to speakto the calledparty until the calling party has deposited-the right coin in said coinmechanism, means whereby the calling party may actuate said coinmechanism to register and collect the right coin which the calling'partydepositsin said coin mechanism, and 'means'to enable the calling partyto utilize the telephonewhen the coin is collected- In testimony whereofI my signature.

BRYANT D. CAMPBELL.

